The challenge

Building a real-time feed that scales to thousands of concurrent users without suffering from database connection starvation or N+1 query overhead.

The approach

Fan-Out on Write Architecture: Cached user timelines in Redis for sub-millisecond timeline retrieval. Interactive Code Blocks: Integrated Monaco Editor and Shiki syntax highlighting for beautiful in-feed code snippets. Optimistic UI Updates: Users experience zero perceived lag when liking, bookmarking, and replying to posts.

What we did

• //001Fan-Out on Write Architecture
• //002Interactive Code Blocks
• //003Optimistic UI Updates